If it another person's aircraft or a club aircraft then they can say what you must do and you can do it or not fly the aircraft.
Yes to a degree, and I agree but if they said I want you to fly around Tower Bridge at 100 feet you may want to decline which brings us back to the law again.
My examples all point to another pilot on board having access to the controls Eg Supervision. If a check out requires supervision and an accompanying pilot is on board as as supervisor a record of that supervison (which is part of that pilots personal experience) should be contained in that pilots log book.
So we have a supervisor and a commander!